Malicious PDF — malware analysis report

Static analysis result for SHA-256 157833c39d28bc96…

MALICIOUS

PDF

44.6 KB Created: 2020-10-06 21:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: bf136cac13371f862bbb1d2895f5395d SHA-1: 54307ae80b55f1c91b5b10a4aabc0c272521c78c SHA-256: 157833c39d28bc965a574bd7b90a71b96ba5f304c25b0fee30dfab5cf44f9580
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/pify?keyword=where+to+watch+detective+pikachu+canada In PDF document text
    • http://vetuf.shopmerryweathers.com/uploads/1/3/1/4/131438847/6935852.pdfIn PDF document text
    • http://files.otty-jc.org/uploads/1/3/2/6/132682193/zixigo.pdfIn PDF document text
    • http://wevux.blueridgebarassociation.com/uploads/1/3/2/7/132740494/26ec681ae55.pdfIn PDF document text
    • http://files.readingswithkaren.ca/uploads/1/3/0/7/130739618/7d5c7e0a49e926e.pdfIn PDF document text
    • http://files.miamibeautyboutique.shop/uploads/1/3/1/4/131437669/suzuzexe_sulun_zanejozixufon_tidada.pdfIn PDF document text
    • https://site-1038360.mozfiles.com/files/1038360/92438244785.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/josubed.pdfIn PDF document text
    • https://site-1041292.mozfiles.com/files/1041292/vugapogurefevokupitatof.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/nobubaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dc368f59-c5b1-4d4d-9c01-536e281762a3/tufejoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c514beee-8a67-4c02-a873-c100b389b10c/kedatejenebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2867d448-a647-4c01-8f28-0f164496930f/golazazugolex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648fdbce-4e0e-44dd-b292-a111d03e6187/6648380080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47484aa5-a7ec-4f83-ab85-34f9ca529531/rugemaratamasewirosa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A1 5064 bytes
SHA-256: 99be352624718f834f2c78d847cc444765728d0d743441ecd4c558add1a0d799
font_01_sfnt_off000073ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73EF 10392 bytes
SHA-256: 160ba029a6901deda192503f7814e52ca7f163d92850b442400693e54bb947b0
font_02_sfnt_off00009783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9783 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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